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The low learning outcomes of third grade elementary school students on the material of the properties of flat shapes are indicated due to the unavailability of adequate modules. This study aims to develop an ethnomathematics-based module that is valid, practical, and effective in improving learning outcomes on the properties of flat shapes. This research uses research and development methods through the ADDIE stages. The subjects of this study were 22 third grade students. The validity obtained an average score of 1 with very valid criteria. Practicality obtained a score of 94% with very practical criteria. Effectiveness obtained a significance value of 0.000 <0.05 which can improve student learning outcomes. The implication of the results of this study is to provide an example of a valid, practical, and effective ethnomathematics-based module to improve the learning outcomes of grade three elementary school students on the material of the properties of flat shapes.
Masruroh et al. (Tue,) studied this question.